At what weight can a kid take the 10mg dose of loratadine? Bottle says "age 6" but my kids small. What weight?

Well tolerated. I wouldn't worry much about the dose level. This medication has one of the safest profiles of any of the over the counter medications. The suggested dose for 2-5 is 5mg and a dissolving tablet is available in some local. Adult studies found no increased benefit or side effects with a double dose of 20 mg. So having a smallish 6 yo take the 10 would be fine.